A Good Reason To Go Full-Time SSL For Gmail
One thing that I find somewhat counterproductive is that browsers do not save files sent over SSL in their caches.
It's sensible, I suppose, to assume that if something's sent over an SSL channel that it's sensitive and therefore shouldn't be saved, but it would give a speed and bandwidth efficiency hit which would deter usage of SSL for everyday browsing.
You could, of course, have the HTML transmitted over SSL and the supporting images over plain HTTP, but then the browser will scare people by warning that not all content on the page is secure..
I think browsers should start looking at encrypting their cache files, so that stuff such as SSL can be accommodated without breaking caching.